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vendor:yamaha [2019/05/06 14:40]
lord_nightmare I new = 5 old = Sharp, we think?
vendor:yamaha [2019/09/23 23:18]
lord_nightmare add note
Line 15: Line 15:
   Yamaha Datecode/Markings:   Yamaha Datecode/Markings:
   1981-1989 'old style': (may have been used very briefly in 1990)   1981-1989 'old style': (may have been used very briefly in 1990)
-  yM ww Ll r+  ym dd Ll r 
 +  m = month (1-9 = Jan-Sep, X=oct, Y=nov, Z=dec) 
 +  dd = day within month 
 +  L might be a manufacturer code, but could also be the msb of the lot code? 
 +  
   1990+ 'new style':   1990+ 'new style':
   Yyww MLlr   Yyww MLlr
   Y = year most significant (9 or 0 or 1 for 199x or 200x or 201x)   Y = year most significant (9 or 0 or 1 for 199x or 200x or 201x)
   y = year least significant (2 = 1982, 3 = 1983 ... etc ... 9 = 1989) (0 = 1990?)   y = year least significant (2 = 1982, 3 = 1983 ... etc ... 9 = 1989) (0 = 1990?)
 +  ww = week within year
   M = Manufacturer code, see table below; old style and new style chips have different tables   M = Manufacturer code, see table below; old style and new style chips have different tables
   Ll = lot code/batch code?   Ll = lot code/batch code?
-  ww = week within year 
   r = die revision   r = die revision
  
  
 ====== Fabs ====== ====== Fabs ======
- 
-  'old style' markings: 
-  1 =  
-  2 = Sharp? 
-  3 = 
-  4 (= L) = Hitachi 2 
-  5 (= I) = Sharp 
-  6 = Hitachi 
-  7 = 
-  8 = Hitachi or ROHM (NDIP)? 
-  9 = 
-  X = 
-  Y = Hitachi? 
-  Z = Fujitsu 
  
   'new style':   'new style':
Line 53: Line 43:
   L (= 4) = Hitachi 2   L (= 4) = Hitachi 2
   O =   O =
-  Z = Fujitsu [This is interesting, possibly a printing error which should have been F but they printed a Z instead?]+  Z = Fujitsu 2
  
 ====== Chips ====== ====== Chips ======
 
vendor/yamaha.txt · Last modified: 2020/10/01 01:25 by lord_nightmare
 
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